Patriot LS6 heads..
01-10-2004, 02:21 PM
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Patriot LS6 heads..
i bought some stage 2 ls6 heads from patriot...i was gonna put them on the 6.0 im buildin but i think im gonna sell the 6.0...im keepin the heads though...i was just wanderin how these heads would work with a 5.3 motor...the cc is 59...what would that bump my compression up to? thanks
01-10-2004, 02:30 PM
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Originally Posted by Okie02
i bought some stage 2 ls6 heads from patriot...i was gonna put them on the 6.0 im buildin but i think im gonna sell the 6.0...im keepin the heads though...i was just wanderin how these heads would work with a 5.3 motor...the cc is 59...what would that bump my compression up to? thanks
01-10-2004, 02:49 PM
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Originally Posted by XLR8NSS
Just swapping those heads on will bump the compression ratio up to around 9.7:1. That's assuming a stock 5.3L bottom end, gaskets, and old combustion chamber size of 61cc.
01-10-2004, 03:21 PM
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What size valves do they have? You might want to check and make sure they'll be Ok with the smaller 5.3L bore size.
If the valves will fit then I think you'll pick up a nice amount of power.
If the valves will fit then I think you'll pick up a nice amount of power.
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01-10-2004, 04:10 PM
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Yeah, I think that is too big. The stock bore size is only 3.78" and those valve are nearly that big without any space in between them and beside them accounted for. Even if they did fit the cylinder would be shrouding the vavle pretty bad which would hurt flow.
You could always bore out the motor to 5.7L specs and get some forged 5.7L pistons or even some stock 5.7L pistons. Those heads would work great on that setup. Stock LS1 pistons with that setup would be around 11.3:1cr. You'd need 6-7cc valve reliefs to get down to around 10.5:1 on that setup.
You could always bore out the motor to 5.7L specs and get some forged 5.7L pistons or even some stock 5.7L pistons. Those heads would work great on that setup. Stock LS1 pistons with that setup would be around 11.3:1cr. You'd need 6-7cc valve reliefs to get down to around 10.5:1 on that setup.
01-10-2004, 06:31 PM
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Originally Posted by Okie02
one person says they should work the other thinks the valves will be too big...does any1 know for sure? thanks
https://ls1tech.com/forums/showthread.php?t=124694